The scope of the 56st round National Sample Survey includes:
- Demographic Characteristics of Household Members: Relation to head, sex, age, marital status and educational level of each household member. This section also includes number of meals taken by each member of the household.
- Household Characteristics: Household size and type, ownership and type of land, primary source of energy used for cooking and lighting, availability of regular salary earner in household, and possession and type of ration card.
- Consumption and Expenditure: Household consumer expenditure is measured as the expenditure incurred by a household on domestic account during a specified period, called reference period. It includes the imputed values of goods and services, which are not purchased but procured otherwise for consumption.
The geographical coverage of the survey was to be the whole of the Indian Union except Ladakh and Kargil districts of Jammu & Kashmir, 768 interior villages of Nagaland and 172 villages in Andaman & Nicobar Islands which remain inaccessible throughout the year. In addition, certain districts of Jammu & Kashmir viz., Doda, Anantnag, Pulwama, Srinagar, Badgam, Baramula and Kupwara, as well as Amritsar district in Punjab, had to be excluded from the survey coverage due to unfavourable field conditions.
Producers and sponsors
National Sample Survey Organisation (NSSO)
Ministry of Statistics and Programme Implementation (MOSPI)
1. A stratified two-stage sample design with villages (Panchayat wards in case of Kerala) / UFS blocks as the first stage units (FSUs) and manufacturing enterprises in the unorganised sector (OAME/ NDME / DMEs) as the ultimate stage units (USUs) has been adopted. For consumer expenditure and employment-unemployment survey, households are the USUs as usual.
2. Sampling Frame: EC '98 with enterprise/ establishment level data is taken as the frame for the survey for the whole of India except Orissa (EC '98 work not completed) & 66 towns of Karnataka (EC-98 work not done using UFS blocks). For Orissa, Population Census 1991 is taken as frame. Sampling frame for 66 towns of Karnataka and all towns of Orissa is the UFS blocks. Similar frame is to be taken for the States for which EC '98 cannot be used.
Rural: Each district will be treated as a stratum for all States/UTs. In all States/UTs except Orissa, each district will be divided into three sub-strata as under:
- sub-stratum 1: FSUs with no unorganized manufacturing enterprises
- sub-stratum 2: FSUs with at least one DME in the unorganized sector
- sub-stratum 3: remaining FSUs
Sub-stratum 1 with less than 20 FSUs is to be merged with sub-stratum 3 and vice versa. Sub-stratum 2 with less than 8 FSU will be merged with sub-stratum 3.
As EC-98 work is not complete for Orissa the principle of stratification in this state is based on Population Census 1991. In this case, each district will be a stratum but there will be two sub-strata within each district:
- sub-stratum 1: All FSUs with population between 0 to 50 as per Census 1991.
- sub-stratum 2: The remaining FSUs.
Formation of a sub-stratum may be considered only if there are at least 20 FSUs in that sub-stratum; otherwise there will not be any sub-stratification. However, all FSUs in this case will be identified with sub-stratum 2 for processing work.
Urban: Strata will be formed within each NSS region of a State/UT. The towns within an NSS region is stratified according to the population of the towns as per 1991 population Census as given below ( P stands for population of '91 census ):
- Stratum 1: all towns with P <= 50000
- Stratum 2: all towns with 50000 < P <= 100000
- Stratum 3: all towns with 100000 < P <= 500000
- Stratum 4: all towns with 500000 < P <= 1000000
- Stratum 5/ 6/ 7: Each town with P > 1000000
Within each stratum ( except for Orissa and part of Karnataka ) three sub-strata will be formed as under:
- sub-stratum 1: FSUs with no unorganized manufacturing enterprises
- sub-stratum 2: FSUs with at least one DME in the unorganized sector
- sub-stratum 3: remaining FSUs .
Sub-stratum1 with less than 20 FSUs is to be merged with sub-stratum 3 and vice versa. Sub-stratum 2 with less than 8 FSUs will be merged with sub-stratum 3.
For Karnataka, there are 66 towns where UFS blocks were not used for EC-98 work. The stratification procedure is therefore modified for the urban sector of Karnataka in the following manner:
All the towns of the State will first be grouped into NSS region ´ town classes as per the criteria given above. Then within each region ´ town class, two strata will be formed. The towns included in the list of 66 special category towns will form a special stratum within a region ´ town class. The rest of the towns within the region ´ town class will form a general stratum.
Sub-stratification for general strata of Karnataka will be same as in the case of other States/UTs. For special strata of Karnataka and all the strata of Orissa, three sub-strata will be formed as follows:
- sub-stratum 1: all FSUs ( i.e. UFS blocks as per the latest UFS ) identified as Industrial Area ( IA).
- sub-stratum 2: all FSUs identified as Bazar Area ( BA).
- sub-stratum 3: the remaining FSUs
If an FSU has been identified as mixed area type e.g. IA and BA, BA and RA, etc. priority order for inclusion in sub-strata will be IA and then BA e.g. an FSU identified as both IA and BA will belong to sub-stratum 1. If there are less than 20 FSUs in a sub-stratum, it will be merged with other sub-stratum. Sub-stratum1 will be merged with sub-stratum 2 and sub-stratum 2 will be merged with sub-stratum 3 in such cases.
4. Sample Size: State/UT level sample size is decided on the basis of its investigator strength. Considering that 818 investigators are in position with FOD and that the State Statistical agencies of Arunachal Pradesh, Manipur, Mizoram and Tripura are able to survey about 840 FSUs of central sample, the total sample size for Central Sample is fixed at 15032. Total State sample size is fixed at 17096 taking care of prevalent matching pattern for almost all states. Table T0 gives the Statewise details of the allocations of sample size by State/UT.
5. Allocation between rural and urban sectors: The allocation of FSUs between rural and urban sectors is made in proportion to the number of workers engaged in unorganized non-agricultural enterprises as per EC '98 (Census '91 for Orissa) with 1.5 weightage to Urban sector.
6. Allocation among strata/sub-strata: Allocations to strata/sub-strata in both rural and urban sectors (except for urban sector of Orissa and special urban strata in Karnataka) will be made in proportion to the number of non-agricultural workers in the unorganized sector as per EC '98.
For Orissa rural, allocation has been made to strata/sub-strata in proportion to non-agricultural workers as per population Census'91. For urban strata of Orissa, allocation will be made in proportion to the number of FSUs in the strata. Allocations to sub-strata within the stratum will then be done in proportion to number of FSUs in the sub-strata with weights 2, 2 and 1 for sub-stratum 1, 2 & 3 respectively.
For the special urban strata of Karnataka, stratum allocations will be made in proportion to number of non-agricultural workers as per EC '98. But sub-stratum allocations will be made in the same manner as for urban sub-strata of Orissa.
Allocation to any stratum/sub-stratum will be adjusted to a multiple of 2 FSUs. ( If the proportional allocation turns out to be less than three, it will be adjusted to 2. If the allocation is greater than or equal to 3 but less than 5, it will be adjusted to 4 and so on.)
While allocating FSUs to stratum/sub-stratum it is ensured that each (stratum x sub-stratum ´ sub-sample) is represented.
7. Selection of FSUs: For sub-stratum 1 in rural/urban sector of each State/UT, all urban sub-strata of Orissa and all special strata/sub-strata relating to 66 towns of Karnataka, FSUs will be selected with equal probability and without replacement. For all other sub-strata in both rural and urban sectors, FSUs will be selected circular systematically with PPS, size being the number of manufacturing workers in the unorganized sector as per EC '98. (For Orissa rural, size in this case will be manufacturing workers as per census '91. If an FSU has no manufacturing worker, size 1 will be assigned to that FSU before drawing samples). However, some manufacturing enterprises may have large number of workers as per EC '98 frame even though they are in the unorganized sector. Some adjustment to the size of workers for such enterprises will be made before calculating the size of FSUs. For this purpose, any unorganized manufacturing enterprise having more than 200 workers will be deemed to have a size equal to 200. Enterprise sizes will thereafter be added up to get the FSU size and sub-stratum / stratum size.
Samples will be drawn in the form of two independent sub-samples separately for rural and urban sectors. For uniform spread of field work over the survey period all the samples of a state for central and state separately will be arranged first by stratum and then each stratum by sub-stratum and each sub-stratum by sub-sample and then sub-round number will be assigned against sample FSUs in the sequence 1, 2, 3 and 4.
Note: Detail sampling procedure is provided as external resource.
Dates of Data Collection
Data Collection Mode
Schedule 1.0 - Consumer Expenditure
Schedule design: Schedule 1.0 has been split into several blocks to obtain detailed information on the expenditure incurred on domestic consumption and other particulars of the sample household. Besides, information will be collected on sufficiency of food. No account will, however, be taken of any expenditure incurred towards the productive enterprises of the households.
Block 0 - Descriptive identification of sample household: This block is meant for recording descriptive identification particulars of a sample household.
Block 1- Identification of sample households: This block is meant for recording the identification particulars of the sample households. The identification particulars for items 3-11 will be copied from the corresponding items of block 1 of listing schedule 0.0.
Block 2- Particulars of field operations: The identity of the Investigator, Assistant Superintendent and Superintendent associated, date of survey/inspection/scrutiny of schedules, despatch, etc., will be recorded in this block against the appropriate items in the relevant columns
Block 3- Household characteristics: The characteristics to be recorded in this block are mainly intended to be used to classify the households for tabulation.
Block 4- Demographic and other particulars of household members: All members of the sample household will be listed in this block. Demographic particulars (viz., relation to head, sex, age, marital status and general education), working status, type of income received and number of meals taken will be recorded for each member using one line for one member.
Block 5- Consumption of food, pan, tobacco and intoxicants: In this block information on consumption of each item of food, pan, tobacco and intoxicants for the household for a reference period of 30 days preceding the date of survey will be collected.
Block 6- Consumption expenditure on clothing, bedding, etc. : In this block, information on quantity and value of consumption of all items of clothing will be collected. The information in this block is required to be collected for a reference period of last 365 days. Consumption of clothing is defined as an item of clothing being brought into first-use. Clothing purchased first-hand will be considered for reporting against items 360 to 373 and items 380 to 387 (bedding, etc.). However, in case of second-hand purchase, total value of clothing purchased second-hand will be recorded against item 374: clothing (second-hand).
Block 7- Consumption of footwear: While filling in this block on purchase and consumption of footwear, the general instructions given for filling in the block on clothing will be followed. The quantity (number of pairs) and value (Rs) to be recorded are to be entered in whole number only.
Block 8.1- Expenditure on education and medical (institutional) goods and services: Under this block, information will be collected on educational and institutional medical expenses incurred during the last 365 days preceding the date of survey.
Block 8.2- Expenditure on miscellaneous goods and services including medical (non-institutional), rents and taxes: In this block, relating to miscellaneous goods and services, information will be collected on the expenditure for purchase of these items during the reference period. The actual expenditure incurred towards purchase of these items, used for non-productive purposes, will be considered as the consumer expenditure of the household. Expenditure both in cash and kind will be taken into account. The reference period will be the last 30 days prior to the date of survey.
Block 9- Expenditure for purchase and construction (including repair and maintenance) of durable goods for domestic use: Information on expenditure incurred for purchase and cost of raw materials and services for construction and repairs of durable goods for domestic use during the last 365 days will be collected in this block.
Block 10- Perception of household regarding sufficiency of food: This block will be filled after completion of the enquiry on all the preceding blocks.
Block 11- Summary of consumer expenditure: This block is meant to derive the value of household per capita consumption expenditure for a period of 30 days. Most entries in this block are transfer entries from blocks 5 to 9.
Block 12- Remarks by investigator: Any remark which is considered necessary for explaining any peculiarity in the consumption pattern of the household or any other characteristic of the household will be noted here.
Block 13- Comments by supervisory officer(s): The supervisory officers should note their views on any aspect relating to the household and on any observed peculiarity in the consumption pattern of the household.
Use of the dataset must be acknowledged using a citation which would include:
- the Identification of the Primary Investigator
- the title of the survey (including country, acronym and year of implementation)
- the survey reference number
- the source and date of download
Disclaimer and copyrights
The user of the data acknowledges that the original collector of the data, the authorized distributor of the data, and the relevant funding agency bear no responsibility for use of the data or for interpretations or inferences based upon such uses.
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